<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>我的网站</title>
  <link rel="stylesheet" href="{{url_for('static',filename='ys.css')}}"/>
</head>
<body>
    <nav>我是导航栏</nav>
    <section>
        {%block sec%}
            <p>我是主题内容</p>
        {%endblock%}
    </section>
    <footer>我是页脚区域</footer>
</body>
</html>